I thought x86 was pretty straightforward once I understood the octal encoding. Cosmopolitan provides a 3kb x86 instruction length decoder that supports all past

I thought x86 was pretty straightforward once I understood the octal encoding. Cosmopolitan provides a 3kb x86 instruction length decoder that supports all past, present, and future ISAs: https://github.com/jart/cosmopolitan/blob/master/third_party/xed/x86ild.greg.c https://github.com/jart/cosmopolitan/blob/master/third_party... The Cosmopolitan codebase also provides a debugger / emulator for i8086 + x86-64 that's similar to GDB TUI and Bochs. See https://justine.lol/blinkenlights/index.html https://justine.lol/blinkenlights/index.html For example, here's the ALU code: https://github.com/jart/cosmopolitan/blob/master/tool/build/lib/alu.c https://github.com/jart/cosmopolitan/blob/master/tool/build/...